In the last few weeks I've noticed that every now and then I look at my phone and I see a 'SIM Card Error' message, during which I can't receive/make calls or send/receive messages. A quick restart of the phone and it's good to go.

This seems to be happening now 3-4 times a week, and I'm starting to get annoyed as its making me miss calls and messages. Any ideas on how to resolve this?

I've also been getting these with increasing frequency. Funny they disappeared for a while and then became more frequent as of late. Removed my sim today and looked carefully at it, there appeared to be some depressions in the sim and I am thinking the contact might not be so great, so I bent down the little pressure creating arm. My sim is really old (been used in a number of different Blackberries as well as other phones).

That's what I did . Mine was so warped , it looked like the Copper Scrolls . They put in anyway . Got the Error the 2nd morning I had it . You would think they'd transfer the data to a new one after seeing the condition it was in . The phone was not free .

I later saw a post about the door not closing properly , but there was no way that one would sit flat . I was shocked actually .

Happened to me last week for the first time. I just pulled the battery, made sure the SIM was fully seated in it's holder and popped the battery back in. Had this phone for about a month so far and that has been the only issue as of yet.